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Message-Id: <W1E50R.77NJ4ON3G1EY2@crapouillou.net>
Date: Tue, 28 Sep 2021 15:10:44 +0100
From: Paul Cercueil <paul@...pouillou.net>
To: "H. Nikolaus Schaller" <hns@...delico.com>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Kees Cook <keescook@...omium.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Andrzej Hajda <a.hajda@...sung.com>,
Neil Armstrong <narmstrong@...libre.com>,
Robert Foss <robert.foss@...aro.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Ezequiel Garcia <ezequiel@...labora.com>,
Harry Wentland <harry.wentland@....com>,
Sam Ravnborg <sam@...nborg.org>,
Maxime Ripard <maxime@...no.tech>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Paul Boddie <paul@...die.org.uk>, devicetree@...r.kernel.org,
linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
letux-kernel@...nphoenux.org, Jonas Karlman <jonas@...boo.se>,
dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v4 06/10] drm/ingenic: Add dw-hdmi driver for jz4780
Hi Nikolaus & Paul,
Le lun., sept. 27 2021 at 18:44:24 +0200, H. Nikolaus Schaller
<hns@...delico.com> a écrit :
> From: Paul Boddie <paul@...die.org.uk>
>
> A specialisation of the generic Synopsys HDMI driver is employed for
> JZ4780
> HDMI support. This requires a new driver, plus device tree and
> configuration
> modifications.
>
> Signed-off-by: Paul Boddie <paul@...die.org.uk>
> Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
> drivers/gpu/drm/ingenic/Kconfig | 9 ++
> drivers/gpu/drm/ingenic/Makefile | 1 +
> drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c | 142
> ++++++++++++++++++++++
> 3 files changed, 152 insertions(+)
> create mode 100644 drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
>
> diff --git a/drivers/gpu/drm/ingenic/Kconfig
> b/drivers/gpu/drm/ingenic/Kconfig
> index 3b57f8be007c..4c7d311fbeff 100644
> --- a/drivers/gpu/drm/ingenic/Kconfig
> +++ b/drivers/gpu/drm/ingenic/Kconfig
> @@ -25,4 +25,13 @@ config DRM_INGENIC_IPU
>
> The Image Processing Unit (IPU) will appear as a second primary
> plane.
>
> +config DRM_INGENIC_DW_HDMI
> + bool "Ingenic specific support for Synopsys DW HDMI"
> + depends on MACH_JZ4780
> + select DRM_DW_HDMI
> + help
> + Choose this option to enable Synopsys DesignWare HDMI based
> driver.
> + If you want to enable HDMI on Ingenic JZ4780 based SoC, you should
> + select this option..
> +
> endif
> diff --git a/drivers/gpu/drm/ingenic/Makefile
> b/drivers/gpu/drm/ingenic/Makefile
> index d313326bdddb..3db9888a6c04 100644
> --- a/drivers/gpu/drm/ingenic/Makefile
> +++ b/drivers/gpu/drm/ingenic/Makefile
> @@ -1,3 +1,4 @@
> obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
> ingenic-drm-y = ingenic-drm-drv.o
> ingenic-drm-$(CONFIG_DRM_INGENIC_IPU) += ingenic-ipu.o
> +ingenic-drm-$(CONFIG_DRM_INGENIC_DW_HDMI) += ingenic-dw-hdmi.o
> diff --git a/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
> b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
> new file mode 100644
> index 000000000000..dd9c94ae842e
> --- /dev/null
> +++ b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
> @@ -0,0 +1,142 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
> + * Copyright (C) 2019, 2020 Paul Boddie <paul@...die.org.uk>
> + *
> + * Derived from dw_hdmi-imx.c with i.MX portions removed.
> + * Probe and remove operations derived from rcar_dw_hdmi.c.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/bridge/dw_hdmi.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_print.h>
> +
> +static const struct dw_hdmi_mpll_config ingenic_mpll_cfg[] = {
> + { 45250000, { { 0x01e0, 0x0000 }, { 0x21e1, 0x0000 }, { 0x41e2,
> 0x0000 } } },
> + { 92500000, { { 0x0140, 0x0005 }, { 0x2141, 0x0005 }, { 0x4142,
> 0x0005 } } },
> + { 148500000, { { 0x00a0, 0x000a }, { 0x20a1, 0x000a }, { 0x40a2,
> 0x000a } } },
> + { 216000000, { { 0x00a0, 0x000a }, { 0x2001, 0x000f }, { 0x4002,
> 0x000f } } },
> + { ~0UL, { { 0x0000, 0x0000 }, { 0x0000, 0x0000 }, { 0x0000,
> 0x0000 } } }
> +};
> +
> +static const struct dw_hdmi_curr_ctrl ingenic_cur_ctr[] = {
> + /*pixelclk bpp8 bpp10 bpp12 */
> + { 54000000, { 0x091c, 0x091c, 0x06dc } },
> + { 58400000, { 0x091c, 0x06dc, 0x06dc } },
> + { 72000000, { 0x06dc, 0x06dc, 0x091c } },
> + { 74250000, { 0x06dc, 0x0b5c, 0x091c } },
> + { 118800000, { 0x091c, 0x091c, 0x06dc } },
> + { 216000000, { 0x06dc, 0x0b5c, 0x091c } },
> + { ~0UL, { 0x0000, 0x0000, 0x0000 } },
> +};
> +
> +/*
> + * Resistance term 133Ohm Cfg
> + * PREEMP config 0.00
> + * TX/CK level 10
> + */
> +static const struct dw_hdmi_phy_config ingenic_phy_config[] = {
> + /*pixelclk symbol term vlev */
> + { 216000000, 0x800d, 0x0005, 0x01ad},
> + { ~0UL, 0x0000, 0x0000, 0x0000}
> +};
> +
> +static enum drm_mode_status
> +ingenic_dw_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
> + const struct drm_display_info *info,
> + const struct drm_display_mode *mode)
> +{
> + if (mode->clock < 13500)
> + return MODE_CLOCK_LOW;
> + /* FIXME: Hardware is capable of 270MHz, but setup data is missing.
> */
> + if (mode->clock > 216000)
> + return MODE_CLOCK_HIGH;
> +
> + return MODE_OK;
> +}
> +
> +static bool
> +ingenic_dw_hdmi_mode_fixup(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted_mode)
> +{
> + adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
> DRM_MODE_FLAG_PVSYNC);
> + adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC |
> DRM_MODE_FLAG_NVSYNC);
Why do these flags need to be cleared? The LCDC can work with negative
v/h sync, does the HDMI core not work with that?
> +
> + return true;
> +}
> +
> +static const struct drm_bridge_timings ingenic_dw_hdmi_timings = {
> + .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,
That info should be provided in the EDID, is this really needed here?
Cheers,
-Paul
> +};
> +
> +static struct dw_hdmi_plat_data ingenic_dw_hdmi_plat_data = {
> + .mpll_cfg = ingenic_mpll_cfg,
> + .cur_ctr = ingenic_cur_ctr,
> + .phy_config = ingenic_phy_config,
> + .mode_valid = ingenic_dw_hdmi_mode_valid,
> + .mode_fixup = ingenic_dw_hdmi_mode_fixup,
> + .timings = &ingenic_dw_hdmi_timings,
> + .output_port = 1,
> +};
> +
> +static const struct of_device_id ingenic_dw_hdmi_dt_ids[] = {
> + { .compatible = "ingenic,jz4780-dw-hdmi" },
> + { /* Sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, ingenic_dw_hdmi_dt_ids);
> +
> +static int ingenic_dw_hdmi_probe(struct platform_device *pdev)
> +{
> + struct dw_hdmi *hdmi;
> + struct regulator *regulator;
> + int ret;
> +
> + hdmi = dw_hdmi_probe(pdev, &ingenic_dw_hdmi_plat_data);
> + if (IS_ERR(hdmi))
> + return PTR_ERR(hdmi);
> +
> + platform_set_drvdata(pdev, hdmi);
> +
> + regulator = devm_regulator_get_optional(&pdev->dev, "hdmi-5v");
> +
> + if (IS_ERR(regulator)) {
> + ret = PTR_ERR(regulator);
> +
> + DRM_DEV_ERROR(&pdev->dev, "failed to get hpd regulator: %s (%d)\n",
> + "hdmi-5v", ret);
> + return ret;
> + }
> +
> + ret = regulator_enable(regulator);
> + if (ret) {
> + DRM_DEV_ERROR(&pdev->dev, "Failed to enable hpd regulator: %d\n",
> + ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int ingenic_dw_hdmi_remove(struct platform_device *pdev)
> +{
> + struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
> +
> + dw_hdmi_remove(hdmi);
> +
> + return 0;
> +}
> +
> +static struct platform_driver ingenic_dw_hdmi_driver = {
> + .probe = ingenic_dw_hdmi_probe,
> + .remove = ingenic_dw_hdmi_remove,
> + .driver = {
> + .name = "dw-hdmi-ingenic",
> + .of_match_table = ingenic_dw_hdmi_dt_ids,
> + },
> +};
> +
> +struct platform_driver *ingenic_dw_hdmi_driver_ptr =
> &ingenic_dw_hdmi_driver;
> --
> 2.31.1
>
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